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Class Information
Number: 138
Name: Pipes and tubular conduits >
Description: This class includes:










Class Number Class Name No. of Patents
138/DIG.1

Adhesive

97
138/DIG.4

Air conditioning

45
138/DIG.8

Bent shaped retained

91
138/100

Breakjoint

9
138/101

Distinct layers

4
138/102

With base

2
138/DIG.9

Cellular

58
138/103

Combined

378
138/109

With end structure

792
138/106

With external support structure

220
138/107

Suspended

101
138/110

With hose protector

421
138/104

With indicating means

253
138/108

With means to support disparate element therein

225
138/105

With trench

93
138/DIG.6

Corrosion

123
138/140

Distinct layers

418
138/141

Bonded to each other

548
138/142

Brazed, soldered or welded

74
138/143

Metal

333
138/144

Spirally wound layer

200
138/145

Coated

296
138/146

Diverse coating material

242
138/153

Reinforced

177
138/148

Spaced

310
138/149

With intermediate insulation layer

776
138/151

With longitudinal seam

118
138/152

Material of one layer passing through seam

16
138/147

With mechanical means to hold layers in contact

95
138/150

With spiral seam

73
138/96R

End protectors

279
138/96T

Threaded

150
138/118

Flexible

273
138/123

Braided, interlaced, knitted or woven

165
138/124

Distinct layers

184
138/125

Plastic

432
138/126

Rubber

256
138/127

With metal

204
138/118.1

Casing

328
138/121

Corrugated

519
138/122

Spirally

333
138/137

Distinct layers

767
138/139

Metal liner

95
138/138

With intermediate metal element

141
138/120

Joined sections

255
138/128

Longitudinally seamed

168
138/129

Spirally wound material

302
138/132

Embedded

94
138/133

Metal

161
138/131

Metal core

87
138/134

Metal

147
138/135

With interlocked or clamped edge

139
138/136

Packed or sealed

29
138/130

Oppositely wound

169
138/119

With means for facilitating collapse

154
138/DIG.2

Glass fiber

82
138/155

Joined sections

432
138/156

Longitudinally seamed

178
138/169

Diversity of seam

36
138/170

Permanent type seam

48
138/171

Brazed, soldered or welded

106
138/157

Sectional

140
138/163

Bent over lip or flange

63
138/162

Tongue and slot

118
138/158

With separate mechanical securing means

104
138/159

Bolt, nail, rivet or screw

38
138/160

Radially extending

11
138/161

Externally encircling

34
138/167

With diverse locking means

80
138/168

With interlocking hooks

75
138/164

With packing

21
138/166

With tongue in slot

108
138/165

With wedge

15
138/DIG.10

Metal foil

22
138/178

Miscellaneous

418
138/111

Plural duct

238
138/114

Coaxial

457
138/115

Longitudinally extending common wall

220
138/117

Complementary sections

70
138/116

Distinct

89
138/113

Surrounding radially spaced duct with axially spaced supports for internal duct

284
138/112

With spacer and encircling element

207
138/DIG.5

Pre-stress

32
138/172

Reinforced

306
138/173

Corrugated

197
138/174

With embedded element

276
138/175

Clay, concrete or masonry

86
138/176

Reinforcement under tension

33
138/97

Repairing

954
138/98

Patches

557
138/99

External

281
138/DIG.7

Resins

175
138/DIG.11

Shape

120
138/154

Spirally seamed

175
138/177

Structure

590
138/DIG.3

Teflon™, kel-f

79
138/32

Thawing and freeze protection

91
138/34

Anti-freeze substance

14
138/33

Electric

111
138/35

Portable thawing apparatus

20
138/89

With closures and plugs

1112
138/91

Double end

35
138/93

Inflatable

271
 

Inflation stem type

 
138/89.1

Air and dust cap

11
138/89.2

Combined

10
138/89.3

Air cap

16
138/89.4

Dust cap

21
138/92

Lateral opening

139
138/94

Laterally insertable

206
138/94.3

Line blinds

77
138/94.5

Pivoted

7
138/95

Return bend type

6
138/90

Test plugs

290
138/37

With flow regulators and/or baffles

287
138/39

Flow facilitating

307
138/38

Heat transfer

244
138/40

Restrictors

261
138/44

Central path

408
138/45

Variable restriction

386
138/42

Tortuous path

440
138/43

Variable restriction

193
138/46

Variable restriction

359
138/41

With screen

79
138/26

With pressure compensators

306
138/27

Freeze protecting

24
138/28

Expansible or compressible tube element

41
138/30

Variable capacity chambers

675
138/31

Piston or plunger type

306
138/36

With wear indicator

24
 
 
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